modules/stream_out/gather.c

   1 /*****************************************************************************
   2  * gather.c: gathering stream output module
   3  *****************************************************************************
   4  * Copyright (C) 2003-2004 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_input.h>
  35 #include <vlc_sout.h>
  36
  37 /*****************************************************************************
  38  * Module descriptor
  39  *****************************************************************************/
  40 static int      Open    ( vlc_object_t * );
  41 static void     Close   ( vlc_object_t * );
  42
  43 vlc_module_begin ()
  44     set_description( N_("Gathering stream output") )
  45     set_capability( "sout stream", 50 )
  46     add_shortcut( "gather" )
  47     set_callbacks( Open, Close )
  48 vlc_module_end ()
  49
  50 /*****************************************************************************
  51  * Exported prototypes
  52  *****************************************************************************/
  53 static sout_stream_id_sys_t *Add ( sout_stream_t *, es_format_t * );
  54 static int               Del ( sout_stream_t *, sout_stream_id_sys_t * );
  55 static int               Send( sout_stream_t *, sout_stream_id_sys_t *, block_t* );
  56
  57 struct sout_stream_id_sys_t
  58 {
  59     bool    b_used;
  60
  61     es_format_t fmt;
  62     void          *id;
  63 };
  64
  65 struct sout_stream_sys_t
  66 {
  67     int              i_id;
  68     sout_stream_id_sys_t **id;
  69 };
  70
  71 /*****************************************************************************
  72  * Open:
  73  *****************************************************************************/
  74 static int Open( vlc_object_t *p_this )
  75 {
  76     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
  77     sout_stream_sys_t *p_sys;
  78
  79     p_stream->p_sys = p_sys = malloc( sizeof( sout_stream_sys_t ) );
  80     if( p_sys == NULL )
  81         return VLC_EGENERIC;
  82
  83     if( !p_stream->p_next )
  84     {
  85         free( p_sys );
  86         return VLC_EGENERIC;
  87     }
  88     p_stream->pf_add    = Add;
  89     p_stream->pf_del    = Del;
  90     p_stream->pf_send   = Send;
  91
  92     TAB_INIT( p_sys->i_id, p_sys->id );
  93
  94     return VLC_SUCCESS;
  95 }
  96
  97 /*****************************************************************************
  98  * Close:
  99  *****************************************************************************/
 100 static void Close( vlc_object_t * p_this )
 101 {
 102     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
 103     sout_stream_sys_t *p_sys = p_stream->p_sys;
 104     int i;
 105
 106     for( i = 0; i < p_sys->i_id; i++ )
 107     {
 108         sout_stream_id_sys_t *id = p_sys->id[i];
 109
 110         sout_StreamIdDel( p_stream->p_next, id->id );
 111         es_format_Clean( &id->fmt );
 112         free( id );
 113     }
 114     TAB_CLEAN( p_sys->i_id, p_sys->id );
 115
 116     free( p_sys );
 117 }
 118
 119 /*****************************************************************************
 120  * Add:
 121  *****************************************************************************/
 122 static sout_stream_id_sys_t * Add( sout_stream_t *p_stream, es_format_t *p_fmt )
 123 {
 124     sout_stream_sys_t *p_sys = p_stream->p_sys;
 125     sout_stream_id_sys_t  *id;
 126     int i;
 127
 128     /* search a compatible output */
 129     for( i = 0; i < p_sys->i_id; i++ )
 130     {
 131         id = p_sys->id[i];
 132         if( id->b_used )
 133             continue;
 134
 135         if( id->fmt.i_cat != p_fmt->i_cat || id->fmt.i_codec != p_fmt->i_codec )
 136             continue;
 137
 138         if( id->fmt.i_cat == AUDIO_ES )
 139         {
 140             audio_format_t *p_a = &id->fmt.audio;
 141             if( p_a->i_rate != p_fmt->audio.i_rate ||
 142                 p_a->i_channels != p_fmt->audio.i_channels ||
 143                 p_a->i_blockalign != p_fmt->audio.i_blockalign )
 144                 continue;
 145         }
 146         else if( id->fmt.i_cat == VIDEO_ES )
 147         {
 148             video_format_t *p_v = &id->fmt.video;
 149             if( p_v->i_width != p_fmt->video.i_width ||
 150                 p_v->i_height != p_fmt->video.i_height )
 151                 continue;
 152         }
 153
 154         /* */
 155         msg_Dbg( p_stream, "reusing already opened output" );
 156         id->b_used = true;
 157         return id;
 158     }
 159
 160     /* destroy all outputs from the same category */
 161     for( i = 0; i < p_sys->i_id; i++ )
 162     {
 163         id = p_sys->id[i];
 164         if( !id->b_used && id->fmt.i_cat == p_fmt->i_cat )
 165         {
 166             TAB_REMOVE( p_sys->i_id, p_sys->id, id );
 167             sout_StreamIdDel( p_stream->p_next, id->id );
 168             es_format_Clean( &id->fmt );
 169             free( id );
 170
 171             i = 0;
 172             continue;
 173         }
 174     }
 175
 176     msg_Dbg( p_stream, "creating new output" );
 177     id = malloc( sizeof( sout_stream_id_sys_t ) );
 178     if( id == NULL )
 179         return NULL;
 180     es_format_Copy( &id->fmt, p_fmt );
 181     id->b_used           = true;
 182     id->id               = sout_StreamIdAdd( p_stream->p_next, &id->fmt );
 183     if( id->id == NULL )
 184     {
 185         free( id );
 186         return NULL;
 187     }
 188     TAB_APPEND( p_sys->i_id, p_sys->id, id );
 189
 190     return id;
 191 }
 192
 193 /*****************************************************************************
 194  * Del:
 195  *****************************************************************************/
 196 static int Del( sout_stream_t *p_stream, sout_stream_id_sys_t *id )
 197 {
 198     VLC_UNUSED(p_stream);
 199     id->b_used = false;
 200     return VLC_SUCCESS;
 201 }
 202
 203 /*****************************************************************************
 204  * Send:
 205  *****************************************************************************/
 206 static int Send( sout_stream_t *p_stream,
 207                  sout_stream_id_sys_t *id, block_t *p_buffer )
 208 {
 209     return sout_StreamIdSend( p_stream->p_next, id->id, p_buffer );
 210 }